Which of the following sentences is grammatically correct?

Question

Quizplus · Accepted Answer

Every sentence must contain a subject and predicate.
The subject of a sentence is the person, place, thing, or idea that is doing or being something. You can find the subject of a sentence if you can find the verb. Ask the question, "Who or what is performing the action in the sentence?" and the answer to that question is the subject.
The predicate is the part of a sentence or clause containing a verb and stating something about the subject.
"The patient refused to see a doctor until his wife arrived at the hospital, three hours later." is correct because the subject is "patient" and the predicate is "refused to see a doctor until his wife arrived at the hospital, three hours later."
Because the patient refusing to see a doctor until his wife arriving at the hospital, three hours later. is not grammatically correct because the sentence begins with "because" and leaves the thought incomplete.
Three hours later, the patient to refuse to see a doctor until his wife to arrive at the hospital. is not grammatically correct because "to refuse" is not the correct verb to use in this sentence. The "to" would need to be removed and the "refuse" should be "refuses" to match the singular subject.
The patient refused to see a doctor until his wife arrived at the hospital. Three hours later. is not grammatically correct because the placement of the period results in the second half being an incomplete sentence.

Which of the Following Sentences Is Grammatically Correct